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leaven

leav·en [ lévvən ]


noun  (plural leav·ens)
Definition:
 
1. rising agent: a substance used to make dough rise, especially yeast or another fermenting agent

2. something enlivening: something that lightens the weight or mood of something ( literary )
with a leaven of wit



transitive verb  (past and past participle leav·ened, present participle leav·en·ing, 3rd person present singular leav·ens)
Definition:
 
1. mix yeast in something: to add leaven to dough

2. make food rise: to cause bread or cake to rise using leaven

3. enliven something: to lighten the atmosphere or mood of something ( literary )
His story leavened the mood of the gathering.

[14th century. < Old French levain< Latin levare "to raise"]
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